JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="left">
    </div>
    <div class="right">
    </div>
    <div class="center">
    </div>
</div>

CSS

.container {
    width: 100px;
    height: 20px;
}

.left, .right {
    width: 20px;
    height: 100%;
    float: left;
    background: black;   
}

.right {
    float: right;
}

.center {
    overflow: auto;
    height: 100%;
    background: blue;
}